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ANSI Flange PCDs
The American National Standards Institute (ANSI) dimensions for pitch circle diameter of flange bolts, and the bolt sizes for common pipe sizes and flange ratings are shown in the tables below.
- All bolt holes are 1/8" larger than diameter of bolts.
See our page on Stud and Nut Sizes to determine the correct nut size.
| ANSI 150# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 3/8" | 4 | 1/2" | 3 1/2" |
| 1" | 3 1/8" | 4 | 1/2" | 4 1/4" |
| 2" | 4 3/4" | 4 | 5/8" | 6" |
| 4" | 7 1/2" | 8 | 5/8" | 9" |
| 6" | 9 1/2" | 8 | 3/4" | 11" |
| 8" | 11 3/4" | 8 | 3/4" | 13 1/2" |
| 10" | 14 1/4" | 12 | 7/8" | 16" |
| 12" | 17 " | 12 | 7/8" | 19" |
| 14" | 18 3/4" | 12 | 1" | 21" |
| ANSI 300# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 5/8" | 4 | 1/2" | 3 3/4" |
| 1" | 3 1/2" | 4 | 5/8" | 4 7/8" |
| 2" | 5" | 8 | 5/8" | 6 1/2" |
| 4" | 7 7/8" | 8 | 3/4" | 10" |
| 6" | 10 5/8" | 12 | 3/4" | 12 1/2" |
| 8" | 13" | 12 | 7/8" | 15" |
| 10" | 15 1/4" | 16 | 1" | 17 1/2" |
| 12" | 17 3/4" | 16 | 1 1/8" | 20 1/2" |
| 14" | 20 1/4" | 20 | 1 1/8" | 23" |
| ANSI 600# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 5/8" | 4 | 1/2" | 3 3/4" |
| 1" | 3 1/2" | 4 | 5/8" | 4 7/8" |
| 2" | 5" | 8 | 5/8" | 6 1/2" |
| 4" | 8 1/2" | 8 | 7/8" | 10 3/4" |
| 6" | 11 1/2" | 12 | 1" | 14" |
| 8" | 13 3/4" | 12 | 1 1/8" | 16 1/2" |
| 10" | 17" | 16 | 1 1/4" | 20" |
| 12" | 19 1/4" | 20 | 1 1/4" | 22" |
| 14" | 20 3/4" | 20 | 1 3/8" | 23 3/4" |
| ANSI 900# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 2" * | 6 1/2" | 8 | 7/8" | 8 1/2" |
| 4" | 9 1/4" | 8 | 1 1/8" | 11 1/2" |
| 6" | 12 1/2" | 12 | 1 1/8" | 15" |
| 8" | 15 1/2" | 12 | 1 3/8" | 18 1/2" |
| 10" | 18 1/2" | 16 | 1 3/8" | 21 1/2" |
| 12" | 21" | 20 | 1 3/8" | 24" |
| 14" | 22" | 20 | 1 1/2" | 25 1/4" |
| * 2" Class 1500 is used for 2" Class 900 |
| ANSI 1500# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 2" | 6 1/2" | 8 | 7/8" | 8 1/2" |
| 4" | 9 1/2" | 8 | 1 1/4" | 12 1/4" |
| 6" | 12 1/2" | 12 | 1 3/8" | 15 1/2" |
| 8" | 15 1/2" | 12 | 1 5/8" | 19" |
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